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The origin of the virus is a scientific matter that should be researched by scientists and medical experts, which is the common consensus of the international community, said Geng. "Any attempt to politicize the origin of the virus and shift the blame to other countries is unacceptable."

Over 20 provincial-level regions have issued documents to specify the implementation of the measures, said Duan Yong, an official with the National Health Commission, at a press conference in Beijing.

Xi praised Pakistan's support for China, noting that at the beginning of the epidemic, President Alvi wrote him a letter to convey consolation, and Alvi's latest trip marks his firm support. The Pakistani side also offered everything within their capabilities to provide China with anti-epidemic materials.

All parties should uphold an open environment for global collaboration, Zhong said, suggesting the parties keep their markets open and safeguard the multilateral trading system and oppose protectionism.

"We want to thank China for its valuable donation and we hope to be able to cooperate in the future in other sectors," Najjar said.